setup.py

#!/usr/bin/python3
#
# Copyright (C) 2021--2025 Richard Preen <rpreen@gmail.com>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
#

"""Python setup script for installing XCSF."""

import os
import platform
import subprocess
import sys

from setuptools import Extension, setup
from setuptools.command.build_ext import build_ext


class CMakeExtension(Extension):
    """Creates a CMake extension module."""

    def __init__(self, name, sourcedir=""):
        Extension.__init__(self, name, sources=[])
        self.sourcedir = os.path.abspath(sourcedir)


class CMakeBuild(build_ext):
    """Builds CMake extension."""

    def _get_openmp_root(self):
        """Get OpenMP root path on macOS."""
        if platform.system() == "Darwin":
            try:  # Try Homebrew first
                return subprocess.check_output(
                    ["brew", "--prefix", "libomp"], text=True
                ).strip()
            except (subprocess.CalledProcessError, FileNotFoundError):
                # Try common system paths
                for path in ["/usr/local", "/opt/homebrew"]:
                    if os.path.exists(f"{path}/lib/libomp.dylib"):
                        return path
        return None


    def build_extension(self, ext):
        self.announce("Configuring CMake project", level=3)
        extdir = os.path.abspath(os.path.dirname(self.get_ext_fullpath(ext.name)))
        if not extdir.endswith(os.path.sep):
            extdir += os.path.sep
        if not os.path.exists(self.build_temp):
            os.makedirs(self.build_temp)

        cmake_args = [
            f"-DPYTHON_EXECUTABLE={sys.executable}",
            "-DCMAKE_BUILD_TYPE=Release",
            "-DXCSF_MAIN=OFF",
            "-DXCSF_PYLIB=ON",
            "-DENABLE_DOXYGEN=OFF",
            "-DNATIVE_OPT=OFF",
        ]
        build_args = [ "--config", "Release" ]

        if platform.system() == "Darwin":
            openmp_root = self._get_openmp_root()
            if openmp_root:
                cmake_args += ["-DOpenMP_ROOT=" + openmp_root]
                os.environ["LDFLAGS"] = os.environ.get("LDFLAGS", "") + \
                    f" -L{os.path.join(openmp_root, 'lib')}"

        if platform.system() == "Windows":
            cmake_args += ["-DCMAKE_C_COMPILER=gcc"]
            cmake_args += ["-DCMAKE_CXX_COMPILER=g++"]
            cmake_args += ["-DCMAKE_LIBRARY_OUTPUT_DIRECTORY_RELEASE=" + extdir]
            cmake_args += ["-GMinGW Makefiles"]
        else:
            cmake_args += ["-DCMAKE_LIBRARY_OUTPUT_DIRECTORY=" + extdir]
            build_args += ["-j4"]

        subprocess.check_call(
            ["cmake", ext.sourcedir] + cmake_args, cwd=self.build_temp
        )
        self.announce("Building Python module", level=3)
        subprocess.check_call(
            ["cmake", "--build", "."] + build_args, cwd=self.build_temp
        )


setup(
    ext_modules=[CMakeExtension("xcsf/xcsf")],
    cmdclass={"build_ext": CMakeBuild},
)